ObjFW  Diff

				[Whether we have select() or similar])
			AC_SUBST(OF_SELECT_KERNEL_EVENT_OBSERVER_M,
				"OFSelectKernelEventObserver.m")
		])
		;;
	esac

	AC_CHECK_HEADERS(net/if.h net/if_types.h net/if_dl.h)
	AC_CHECK_HEADERS(net/if.h)
	AC_CHECK_HEADERS(netpacket/packet.h)
	AC_CHECK_FUNCS(if_nameindex)
	AC_CHECK_TYPES([struct sockaddr_dl], [], [], [
		#ifdef HAVE_SYS_TYPES_H
		# include <sys/types.h>
		#endif
		#ifdef HAVE_NET_IF_DL_H
		# include <net/if_dl.h>
		#endif
	])
	AC_CHECK_TYPES([struct sockaddr_ll], [], [], [
		#ifdef HAVE_NETPACKET_PACKET_H
		# include <netpacket/packet.h>
		#endif
	])

	AC_ARG_WITH(tls,
		AS_HELP_STRING([--with-tls], [
			enable TLS support using the specified library
			(yes, openssl, gnutls, securetransport or no)]))
	AS_IF([test x"$with_tls" = x""], [with_tls="yes"])
	tls_support="no"